Tom-- Try looking under the rig about two foot in or halfway in from the edge of the unit on the drivers side. You should see a 1/2" tube hanging down from the belly with a cap on it. If not you may have to loosen the belly in the rear and see if you see a tube there. You do not mention what model Montana you have but I would guess it is there if you just look under the unit behind the rear axle and close to the spare tire.
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